Valve-gear for engines.



No. 648,820. Patented Wlay was. A; WETZEL.

VALVE GEAR FOR ENGINES.

Application filed Feb. 12, 1900.)

2 Sheets-Sheet (No Model.)

flu. 648,820. Patented May I, I900. A. WETZEL.

VALVE GEAR FOR ENGINES.

VApplication filed Feb. 12, 1900.) (No Model.) 2 Sheets-Sheet 2.

. 4X I 1 B g s N I1 l k l m; I 2 i s a i R i g R 5* wits-em at the Na;

SPECiFICAIiON forming part of LettersPatentl q'o. 648,820, dated May 1, 1900.

' ;Applioation filed February 12,1900. senate. 4,966. on model-l Toall when! it may concern-.-

Be it known that LALFRED WETZEL, a sub- Eject of the Eniperor' of Germany, residing at Oharlottenburg, in -theKingdom of Prussia, Empire of Germany, have invented a new and useful: Valve-Gear for Direct-Acting Steam- Engines and :theLik'e',"of which the following is a specification.

My invention consists in a new valve-gear for direct-acting steam-engines and the like.

in which the steam-inlet valves are actuated by the piston. There are separate channels in the cylinder for the inlet and for the outlet of the steam, and consequently also separate means for opening and closing them.

For theinlet ofthe steam valves are employed. Owing to the absence of bevelwheels, eccentrics, eccentric-rods, slide-rods,.

also the lossesarising from the friction and the-number of the parts that may occasion repairs and-other disturbances in the working of the engine are reduced considerably. For the outlet of the steam slides are em; ployed that are pushed forward and backward by the piston at the ends of the stroke either directly or by means of tappets.

An important feature of niyimproved valve-' gear resides in the fact-that the inlet-valves are opened by means of springs secured to the piston and that adjustable springs are employed for pressing the inlet-valves upon their seats for the purpose of regulating the inlet of the steam. The more the tension of the springs pressing the inlet-valves upon their seats is increased the later the valves will be opened and closed, since each spring is that the steam-pressure upon the one side of the valve is counteracted by that upon the other side and that the valve olfers a certain resistance. In this manner a greater quantity of steam may be admitted to the cylinder than before on the piston approaching the end of its stroke, and in general the cut-off point may be varied by adjusting the adjustable springs pressing upon the inlet-valves. The new valve-gear is illustrated in the accompanying drawings, in which- Figure 1 is alongitudinal section of a steamcylinder provided with the new valve-gear, and Fig.2

valve-gear. A is the piston, arranged to reciprocate the cylinder 13.

C and C are the inlet-valves, and andil is a similar s'cctionot' a steamcylinder provided with a modification of the are the outlet-valves, connected by a rod Q5; In Fig. 1 the steam is admitted at R, while:

the exhaust-steam passes outat S. In Figjf.

the openings for the inlet and the outlet of the steam are arranged in a diil'erent manner. It is, however, quite immaterial in what inanner the steam is introduced to the cylinder and what channels are used for the outlet of the steam.

At the external side of the inlet--valves C and C spiral springs D and D, respectively, are arranged to bear on the valves.

. suitable threads in the covers F and F,wh ile the hand-wheels I and I serve for turning the spindleslland II, respectively, in either direction, and thereby shifting the parts E and E, respectively.

For opening the inlet-valves C and O bent leaf-springs K and K, according to Fig. 1,

may be secured to the piston A, their ends L and L" being so formed as to press upon the inner faces of the valves 0 and G, respectively,when the piston A approaches the ends of its stroke, or tappet-s N and N, with spiral springs O'and according to Fig. 2, niay be also that the valve-gear shown in Fig. 2 will employed for opening the inlet-valves, the worl; much in the same manner.

stems M and M of the tappets N and N be- For starting the steam-engine only either 70 ing' arranged toslideendwise in suitable-holes of the inlet-valves 0 need be lifted by some of the piston A and secured against getting suitable device. Since such device, which bit in any approved or well-known manner. may be of any kind, forms no part of this Instead of the bentleaf-springs K K (shown invention, it is not shown in the drawings. in Fig. 1) and of the spring-pressed tap'pets The new valve-gear is speciallysuitable for 75 N N (shown in Fig. 2) other suitable spring direct-acting steam-engines and the like t devices may be secured to the piston A for where the steam is required to expand to a opening the inlet-valves O and O. considerable degree. The chief advantage In Fig. 1 the outlet-valves P and P are derived from the bent springs K K in Fig. 1 slides which are connected by a rod Q, recipor the spring-pressed tappets N N in Fig. 2 8o rocating within the outlet-chamber. In Fig. or other-elastic members, in combination with I5 2 the connecting-rod Q is arranged to slide the adjustable springs D D, bearing upon the in agroove provided in the internal wall of inlet-valves,is that theinlet-valves are opened the cylinder. 13. It is, however, immaterial and closed mueh'later than would be the case whether the; connecting-rod Q be within or if no elastic members were employed. 85 without the-cylinder. 7 Having described my invention, I declare The valve-gear works in the following manthat what I claim, and desire to secure by Letner: WVhen assuming the piston A in Fig. l ters Patent, is Y j I to proceed from the'left-hand side to the :1. The combination with a cylinder, of a riglrt-hand side, then the exhaust-steam conpiston reciprocating therein and provided on go tained in the cylinder B on the .right hand both sides with elastic members, and outside of the piston A will pass out through wardly-opening inlet-valves at the ends of the channel '1 to the outlet S, and the piston said cylinder and arranged to be opened by A on approaching theend of its-stroke will said elastic members alternately for admitpush-forward the slide P and at the same ting the steam or active fluid, substantially 5 time, through the rod Q, the slide P, so that. as ,set forth. i the one slide P closes the channel T and cuts '2. The combination with a cylinder, of a olf the exhaust-steam, while the other slide, piston reciprocating therein and provided on P opens the channel T andallows. the spent both sides with elastic members, ,inlet-valves steam contained in the cylinder on the leftat the ends of said cylinder and arranged to 100 hand side of the piston A to exhaust. Meanbe opened by said elastic'members alternately whilethe end L of the spring will touch on their elastic tension attaining a certain the internal face of the inlet-valve 0 'nd belimit and to be closed when released from said gin to press upon the same, while the spring elastiemembers, adjustable springs bearing K is being gradually put'under tension." At on the external faces of said inlet-valves, and 1 05 acertain position of the piston A, the dismeans for adjusting the tension of said ad- 40 tance of which fromth eeni'l of the stroke de justable springs for the purpose of regulating pends upon the tension of the spiral spring the inlet of the steam or activ'e'fiuid, substan- D, bearing upon the inlet-valve C, the tension tially as set forth. a j of the spring K will have attained such a 3. The combination with a cylinder, of a no height that the resistance of the inlet-valve piston reciprocating therein and provided on is overcome and the latter is opened, where-. both sides with'elastic members, inlet-valves upon the steam will be admitted to the cylinat the ends of said cylinder and arranged to der. At this moment the steam -pressure be opened and closed by the pressure of and upon the external face of the valve 0 will be by the release from said elastic members re- II 5 counteracted by that upon the internal face spectively on their elastic tension reachinga of the valve, so that on the piston going back certain limit and decreasing below a lower the decreasing tension of the spring K relimitrespectively, adjustable springs bearquires to be reduced farther below that point ing on the external faces of said inlet-valves, at which the valve 0 was opened in order to hearing parts arranged to be shifted. in the :20 allow the latter to closer 'The consequence covers of the inlet-valve boxes and bearing of this is that before the valve .0 closes the on said adjustable springs, and screw-spin- I piston A requires to attain a position which dles bearing on said bearing parts and aris farther away from the beginning of the ranged-t0 be turned-by-hand for"'regulating stroke than that'at which the valve 0 had the tensionof said adjustable springs, sub- 12: commenced to open. Thus a sufificient quanstantially as set forth. 6o tity of steam may be admitted to the cylin- 4. The combination with a cylinder, of a ider. The amount of this quantitymay be inpiston reciprocating therein and provided on creased and decreased by adj nsting the ten-- both sides'with elastic members, inlet-valves 'sion of the springs D and D. It is obvious at the. ends of said cylinder and arranged to 130 that on the piston A approachingthe leftbe openedbysaid elastic members alternately hand end of its stroke and then returning the for admitting the steam, outlet-openings at same occurrences will take place with regard theends of said cylinder, and slides connect- I to the spring K and the inlet-valve O. andfe bya rodand arranged for being pushed forward by said piston at the ends of its stroke elastic members adjustable springs bearing on the external faces of'said inlet-valves, means for adjusting the tension of said adjustable springs forthe purpose of regulating v the inlet of the steam, outlet-openings at the ends of said cylinder, and slides connected by a rod and arranged for being pnshedrforward by said piston at the ends of its stroke to'open and close said ontlet-openings respectively, substantially as set forth.

.6. The combination with a cylinder, of a piston reciprocating therein and provided on both sides with elastic members, inlet-valves at the ends of said cylinder and arranged to be opened and closed by the pressure of and by the release from said elastic members respectively on their elastic tension reaching a certain limit and decreasing below a lower limit respectively,'adjustable springs bearing on the external faces of said inlet-valves, bearing parts arranged to be shifted in the covers of the inlet-valve boxes and bearing on said adjustable springs, screw-spindles bearing on said bearing parts and arranged to be turned Dyha'nd for regulating the tension of said adjustable springs, outlet-openings at the ends of said cylinder, and slides connected by a rod and arranged for being pushed forward by said piston at the ends of its stroke to open and close said outlet-openings respectively, substantially as set forth.

I A FRED WETZEL.

Witnesses: 4

WoLnEMAR HAUPT, HENRY HASPER. 

